FROM THE TERTIARY OF VIRGINIA. 265 
Shell conical, elevated, rather thick, imperforate, costate, striate; spire conical, acuminate; sutures very small; 
whorls five, flat; coste transverse, three, noduliferous, alternating with very small strie; last whorl acutely angular, 
carinate; base very much flattened, with large and small strie; mouth quadrilateral, 
Length .15, Breadth .18 of an inch. 
Remarks.—The transverse ribs are generally noduliferous, but, in some cases, they 
are partially or even entirely smooth. The carina, on the last whorl, is always smooth. 
The strie which alternate with the ribs are exceedingly small, so as to be invisible 
except with the aid of a powerful microscope. ‘Those on the base are of various sizes. 
There are generally two large ones near the columella, and near the periphery, while 
those between are smaller. ‘The base is unusually flat, and the mouth is quadrangular. 
T. conus, Pr. 37. Fic. 82. 
T. testd, conicd, crassd, umbilicatd, striatd; spird sub-ovatd, depressd, obtusd, ad apicem levi; suturis latis, im- 
pressis; anfractibus sea, planulatis, ad suturam superiorem subcanaliculatis; striis transversis, impressis, parvis, 
crebris; anfractu ultimo angulato; basi striatd; wmbilico parvo, valde profundo, striis duobus marginato; columella 
recta; aperturd quadrilaterali, obliqud. 
Shell conical, thick, umbilicate, striate; spire sub-ovate, depressed, obtuse, smooth near the apex; sutures wide, 
impressed; whorls six, flattened, sub-canaliculate near the upper suture; striae transverse, impressed, small, 1ume- 
rous; last whorl angulate; base striate; umbilicus small, very profound, margined with two strie; columella straight; 
mouth oblique, quadrilateral. 
Length .25, Breadth .385 of an inch. 
Remarks.—The strize of the base are rather larger than those on the upper part of the 
whorls. ‘They increase as they approach the umbilicus, which is margined by two or 
three much deeper than the rest. ‘T'hey gradually become obsolete as they approach the 
apex, which is smooth. ‘The umbilicus is not large, but very deep, so much s0, indeed, 
as, apparently, to extend to the apex of the shell. It is continued downwards in a groove 
behind the columella. ‘The mouth is nearly rhomboidal. 
This species is closely allied to the 'T’. eboreus, Wagner, from the Tertiary of S. Caro- 
lina, but the umbilicus and numerous strie are sufficient to distinguish it. 
1. Lens, Pr. 37... Fie. 83, 
7’. testd lenticulari, infernd et superné depresso-conicd, crassiusculd, politd, umbilicatd, striata; spird brevissimd, conicd 
nae ; I Hs ) oe ? ? i ’ ) 
minime oblusd; sutwris latis, sub-profundis; anfractibus quatuor, planulatis, ad suturam superiorem canaliculatis; striis 
iransversis, impressis, parvis, raris; anfractu ultimo acute angulato, carinato; basi conicd, striati; wmbilico parvo, profundo, 
striis duobus profundis marginato; apertura quadrato-ovatd. 
Shell lenticular, depressed-conical above and below, rather thick, polished, umbilicate, striate; spire very short, 
conical, slightly obtuse; sutures wide, rather deep; whorls four, flattened, canaliculate at the upper sutures; strie 
few, transverse, impressed, minute ; last whorl acutely angular, carinate; base conical, striate; umbilicus deep, small, 
margined with two deep stri@; mouth quadrately ovate. 
Length .10. Breadth .15 of an inch. 
Remarks.—The unusually long base gives the shell the appearance of a double cone. 
The angle on the last whorl is about half way between the apex and the base. On the 
whorls of the spire, the stria are two in number. There_are three on the upper part of 
the last whorl, the lowest of which is the deepest. There is also a rib margining the 
lower part of the carina, making it appear double. The outer lip appears to be very 
fragile, as, out of four or five specimens now before me, not one has the mouth perfect. 
The whorls are perfectly flat, or even sometimes a little concave. 
VOL. 1X.—70 
